Plasmonic mode interferences and Fano resonances in Metal-Insulator-Metal nanostructured interface.
Plasmonic mode interferences and Fano resonances in Metal-Insulator-Metal nanostructured interface.
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DOI：
10.1038/srep14419
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发表时间：
2015-09-24
影响因子：
4.6
通讯作者：
Maurer T
中科院分区：
文献类型：
--
作者：
Nicolas R;Lévêque G;Marae-Djouda J;Montay G;Madi Y;Plain J;Herro Z;Kazan M;Adam PM;Maurer T
金属-绝缘体-金属系统表现出丰富的物理基础，导致其光谱特性的高度可调谐性。我们进行了一个系统的研究与薄6 nm的电介质间隔的金属-绝缘体-纳米结构的金属系统，并显示了如何纳米粒子的尺寸和激发条件导致的可调谐性和耦合/去耦的本地化和离域等离子体模式。我们还实验证明了一个可调谐的Fano共振在一个宽的光谱窗口600至800 nm的间隙模式与白色光的宽带透射波的界面处的干涉所产生的连续的作用。通过改变入射照明角度的变化，在共振给出的可能性耦合或解耦的本地化和离域模式，并引起强烈的变化的非对称Fano的轮廓。所有这些结果都证实了实验和理论测量之间的交叉比较，确认不同模式的性质。这种富含等离子体激元的系统的高度控制性和可调谐性为具有众多应用的类似系统的设计和工程化铺平了道路。特别是，进行了传感测量，并记录了3.8的品质因数，将该传感器列为该波长范围内最高灵敏度的传感器之一。
Metal-insulator-metal systems exhibit a rich underlying physics leading to a high degree of tunability of their spectral properties. We performed a systematic study on a metal-insulator-nanostructured metal system with a thin 6 nm dielectric spacer and showed how the nanoparticle sizes and excitation conditions lead to the tunability and coupling/decoupling of localized and delocalized plasmonic modes. We also experimentally evidenced a tunable Fano resonance in a broad spectral window 600 to 800 nm resulting from the interference of gap modes with white light broad band transmitted waves at the interface playing the role of the continuum. By varying the incident illumination angle shifts in the resonances give the possibility to couple or decouple the localized and delocalized modes and to induce a strong change of the asymmetric Fano profile. All these results were confirmed with a crossed comparison between experimental and theoretical measurements, confirming the nature of different modes. The high degree of control and tunability of this plasmonically rich system paves the way for designing and engineering of similar systems with numerous applications. In particular, sensing measurements were performed and a figure of merit of 3.8 was recorded ranking this sensor among the highest sensitive in this wavelength range.